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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18a8d223b2f41a8c72b4f482732201b7804fab7e9c65d91af206ec66d447e48' 
  AND token = 'KhD0pf2g4uickED0pO+hKSRIPNrupfWXLMnMuI3s5lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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