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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a39c2f3f67409bb8b5854650b9d4b7807c5b14ac1bc3d82718dc8151ef7b26' 
  AND token = 'GpiZ/NliaxbAI2mrGxlJX+7Z+gFVMrDbUwIjD0eEJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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