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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f0275b1019bb52a47eb99cf369d28bc2e1718ab89daa967911e883b6df6faf' 
  AND token = '6cw1wAi5xdQoyrA7xyWSPCsBiUTVAwNCHy6/XKxiJTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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