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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116f0c316b551d90cad1a546b027b79c9ef0923fa856664a2c1b47abe50369bf' 
  AND token = 'F/S+HDQ1riJsev3at4tkgtIU7nuFS5dFYb7qep91YIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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