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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124e6b60535405927db84d6d3af4ca9fcd44d32da2d12864d930f4783fdcc355' 
  AND token = '/4O3Kbqzf9OVRjuwxRCleL4NuHMDbypIy9zvyZJNSj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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