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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04cbe7672579e83769669637d20b2496d26c7a739137f101f81264df84683e1' 
  AND token = 'C4C3wh/2PkvpolHQd/KpqPEOyb52bJc/ymXCk4GT8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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