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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24c237b18979431d5f5f6b096c4019d22dffc72ee2057a8991b10d69228a322' 
  AND token = '9GSHq4OmgV85rFfO2dQYAUnQNeWQTTR1qpUq1wAqKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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