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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2293abf0868df89add94bcf127b732409694cc00933f849f09353e0206f10742' 
  AND token = '6bj2SgH06QogaThJwGK79AsQoLKmHtowtxZvOdAbZek=' 
  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"
    }
  }
}