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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209df42923d92390867a3ca70c10a3dd8855d02070553d21b96027f4731724ed' 
  AND token = '1qmWtaKBifqRur/x4IJvpUjaWVHex5xs4aHYN8mXXlY=' 
  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"
    }
  }
}