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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7697a2d2531c96095709c48138db25bb2c1c797cc312d167986b6c7c3cdd0be2' 
  AND token = 'ZDWv9Wi4Xv0BoeQyq5pc/SSrG4yMzsLeTrSCTIbYLdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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