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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e9bb670316f824f0a7e11d14b5d74078a0f5cc1b5fef4651032e43bb11969' 
  AND token = 'RShv9p9S/7Um8o2lAzk2RD3AFlhXmAazhDpITpTDnsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}