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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad927ca79626bce1995d3c2f83b5589219c2692f4047e8a3f08925cd2532b9d' 
  AND token = 'hZnLtCZDA10U/qYiL5aEOpoRhNnL6f0g1t94tXIziSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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