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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8debe27548c006cb7ead7234aa8722f131d05e803f6c09da8aac5d12afe08c8a' 
  AND token = 'Nbnk43z5m5xusPgHfE7H/ciQepJY7gh0TSKP5k0/xJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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