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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3c312a6a74fc18394d7fd591b4fcbd07edd607b491fd9df33e66f4e459c911' 
  AND token = 'ZPl40Q1ru2afkU3GRLlye9DQT7k2S7zyf3JeLtIJkUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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