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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5c7bce9363ca7dfc36dd54b9bb5d66df54cd4ab8e2a9bf32de4327aa7f28e7' 
  AND token = 'ZYVnMil21BCmB9WQpuiri/u8tUYkYxrAulRKyLvN9uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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