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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5b10d6069ea7fc75780cf47d29f9d3780515951e2ad0c8abb8b62f965dd16e' 
  AND token = 'Q9c+RyJfO4cBuppzJX4M8dibXwt23hHN3UvYNbwwFFc=' 
  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"
    }
  }
}