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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cf8e821f3047c599231a6e53f98a32ef3133c29fba9fc80dab93767c235468' 
  AND token = '0ADq+beIEayiZ1lTLxQBVNHPCa5FIECc7T1xRVNeNAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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