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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bcd23160c8a3768c485f56c0da186d55a97dc5a1c35681ac1f28d8aea753ff' 
  AND token = '9IUn5yAFfP5SDt3gh+vmwJryybbdq7FkpraKSKj/f50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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