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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ef82a4b4a7442dc76dc902079246ca66c660ef20bc72d55e84c9640046f18e' 
  AND token = 'v94uqwN8aT82Ji91+t0rxzOY9vnGdGTpBKgbDSBujOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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