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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4214b9da5f45143b38dd3f940d49ee26756389d513d5fe9eff51b5bb72b1c34d' 
  AND token = 'rSDjOogQc1Jes3wW/NWCL1BdQSnbxCtUP83wXS8drVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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