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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30914052f93d847d3f78a294e4bc9321a24d110f5c24205a0cc4a2de5be89794' 
  AND token = 'gX9RbjATte3zG/4xrSvkM3Daj7BPjBmbB8lwUrg3Dwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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