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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1180f1036c070d0a9acb8def616d3b10f80c783af10fb3141fe6141f8626c79' 
  AND token = 'I+GyRo6YgiK+D2NjKp5QYf1q4hGOsur2rwsQx4brglY=' 
  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"
    }
  }
}