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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02db0cb858949e72c99e98f230f103613aa783a4b69620f7ad7b34c0c7170eb2' 
  AND token = 'FwUf8lKawNODpx+xDxPcoFB/hIp9Ox6/l9tKiWbo8Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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