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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c165fc41f454b5c74ff59494a39fad048801ce21104cba0dfa36ca3b9cd8d964' 
  AND token = '/lstNr3VyUiyqT7Uf97KjNT8wJ5DQhgz42CXNxB9F5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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