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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1af614439d51a62c72d51bfebe35fa6f4f63c15ea0ac6a532d45c0141909c4' 
  AND token = 'PBcPHMUy6Ecmw3lNfDigwAB9aXZORLe14p2se3Vlahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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