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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7cfcc2ee16d903b085681d8718eca0728e2c9c599b94c035f3ab38f32a0e1b' 
  AND token = 'awWK4aGuKR1FQRW4iJdd9mDs4N0Fs+dF7NpjAk3XVeg=' 
  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"
    }
  }
}