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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb0e1249abebd02d6a17e5895caf0607ef86d07be690f798f3b4f4500718b41' 
  AND token = '94iGjpQ6ImMt4Qy6Yu6Bt8I6YFsZPUwPjy9elX5GMCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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