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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc150432a4c91f4939d76175fc37d8776920b0b44a4ad0af7dd532a1b9c46d0' 
  AND token = '8HIrDBswhiVwfhgKFg3Oht269WmgjoLnFH8CnOo0skg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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