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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45921f2fbe1df5262a844b513db8e496b9b8880328e32dd883fac3c748f988f7' 
  AND token = 'Ce27RKjaSFMDoLlT/g/8o1Cj1wskBmwp80osytQ4gI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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