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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c56ac48aab22e5f6f5224bbc450b752b828cd2021282f4d4f8e83c9d29a66e' 
  AND token = 'yfcuQ7zNcDEDTqeMPDS2j6kOv9Tt4/cXQI2+GBMKMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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