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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44c9b8bc2fa1ba6c59c1bab4b1b5ccb27e9b740575d77533ea279b9acfe4e76' 
  AND token = 'BLncJM1E3B4zut8qUVcT3KxCyi4pL2BSEj7XoVhjQLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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