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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b956259d53dca7f4fa5d32995a771e9e2a04d525cf6bee3f0a888f0d5dfb84' 
  AND token = 'fubsvoakhfZ6LFfhjue9bLQQZDPoO/nJe/wenHnBYDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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