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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92acd0fffbf8448221a04043e33efe6b46e9c69576e2f5cc1b5909a01b33ceb8' 
  AND token = '0MoHizExratlds+JVtV4WjMitp1eDgkZzEVl7Nm2rcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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