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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82d2c8503f97c2bfe548ccc6b2060fd7f00b2f54fbb947e1c9ebd2453110266' 
  AND token = '+DNfP8KGzbq5a8cGokJU+y7hOi+VVjGEfhzV9QeTnAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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