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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb8494d57f8387125fba44302ce1cc5724380039fe5d443226bfcec7ee338f9' 
  AND token = 'tBIrBga+ck9BHZB6zNxYeeK36GYUp9bbXRn5Xvq3Mvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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