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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b57132624d4f84e49020845edb725104306ef78dc1c75ff90f4f21b939c9a4' 
  AND token = 'TGkArbkDoA+6ZhrvFArU8cvbo0sR1WPXJ9BmgqSHiK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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