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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c19aa1a358ad3dd4c514a8cb2400c0094e7467b47b0d7773d30fd8ff8f883c4' 
  AND token = 'EgMlbKSISetkQoZ0c2TKcsCIDZUiVta3ySOWe7XxSB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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