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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149e920be899177e3bd189b7f5b8d82773f32ca270e733ab97063ae58f02bd46' 
  AND token = 'rLSpYoi+rrwhbgmM9++wHHfZa7aYQXtkY0oAxz06Hak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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