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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd1d9747c4aad5bcfa831dba2b464370cd116dc709425a2f6aa9dbb8b4615ae' 
  AND token = 'o8LkODQwU1btm+lPMZueAqBOzvl9FCW5nibo3Xa48fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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