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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71308dbd38864ea54e0e0de3b006b1df247d3b9c3dfe413b5a1a6ac4ad23188e' 
  AND token = 'nj/bLk8Vyxw5f26sWvAlnv/6Lk2YED6XFQAM8Dkw00A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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