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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eee0695d397fa9f5e2f1850ecf401ec0949673fac7edf8f0f3522000058b4e1' 
  AND token = 'lGlxmKn7c0Cq7pOFYawmirDASRCa6PI3gd2gmdTOMrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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