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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2951b9001e96ded3a6a1b6d6e92fb7acddf6d5ae15612ff1facd6295f12c4201' 
  AND token = 'jT161YITgBG6qKKQUwZ7QWhC4Z6foHpwHmS1cZ4or30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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