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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d04121a65420df09da71a74af973ca77711549761f347f62972627e75ed1b95' 
  AND token = 'AuFj5S+Vk1iA0dIMuKZ72/NyHDimnW7znYIUttH0EAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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