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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6c36d94e485cc51bded056ba3d38cb4c1853286e661d2c283b5ec9c51ccc19' 
  AND token = 'yeE8x2NJagQSDIkvfAbXqLZB02Z9Im1izBJZoiI6Eak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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