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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50830cf8f3b0c9c438b8ef41f1f49c5810edfd6df03384ec1255e79f8b5e319c' 
  AND token = '/kY9Hffv2tWHnFBQpEsvtjmIs9w3GvWP9hg5ZWdh0hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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