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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b936dfd147432b94e23cc27a39a5670da6230ae66f4296aa9ecf43f49acd9a' 
  AND token = 'ECVfmwC3+nam+VwKE0ucPNERU0BxZW2Fs/HuadwpgRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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