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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d9640b0acceca4093c70e6cf9b7d4658d15518498b640bbbe332fe45203621' 
  AND token = '7clHlZH3rvGdppChswwJzGyUMHV/uwViDz20iiS34MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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