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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75def3ca9f427a5cda56e54685c7f00dc8ed71538e6da9b4acc41c6186c92907' 
  AND token = '1V8EM0nyVPaBt5lPbq7LgIxkPpvc0T6irPTuhp6H0nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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