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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1345c8b37f724161c9c0946b6acbfaa5460421a3454e090fe107fe192acddd7c' 
  AND token = 'wgUy8tQUAR/cYyQOJs5WfTxG18qL+0xeWdftRlfL4Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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