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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad221c5aebb4492e88a348accfdb1b61e4028ae97a57a69560a1a5a42953919' 
  AND token = 'k2uL2IMpxHVDHcaWfcecmtG2tuyPN6kVqyHUq0E1tIw=' 
  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"
    }
  }
}