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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9291825f0cbc5c3d32c8e6f630cb959e46212e9410ebf508c4426f77cfaa2d09' 
  AND token = 'GiM7J18S3lwdJHKv58Pum8hgOxEfKLXU3pQyj5Ah72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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