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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53455121abce3dbe0f4752e1b1a7244e756e958815ce907551e217c83c82381' 
  AND token = 'qL6QFydwKcvTlYu+1dCUSzFBPxa6ldvnxv+oWnmKOEc=' 
  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"
    }
  }
}