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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae07b5916e33f7f2c91f366cd576e973ac32c179af1a7e8fed015f6638fb3866' 
  AND token = 'jp2a/4Ui3Mhgr+0SjBmk/W6wE9KyPG1I+BowNRz83VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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