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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf15ccf1495bb2527efdf5a5a805ef249fb29ecb1aa9f110b5e1793315e0127' 
  AND token = 'ZKqdMyMP/AceNcHsExpUo8rL/18pZf+JEis3BSp7bnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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